Superwhiz Maths Person (also neutral as to not offend those who have a complex of themselves and others) saysMarch 10, 2018 @ 19:51

Here are some other, more reasonable options:

Due to being restrained in a house with an expecting wife and all the emotional inconsistencies, the husband developed split-personality disorder, and started talking to himself, considering he was now his own best friend.

Due to being restrained in a house with an expecting wife and all the emotional inconsistencies, the husband began seeing double.

One of the two people in the house was in a pantomime, and was actually a person sitting on the shoulders of a second person, hidden under a costume.

The first person always spoke in the third person, and ignored the second.